#include<iostream>
#include<stdio.h>
#include<cstring>
#include<unistd.h>

int main()
{
	//库函数
	printf("hello printf\n");
	fprintf(stdout,"hello fprintf\n");
	const char *s = "hello fwrite\n";
	fwrite(s,strlen(s),1,stdout);

	//系统调用
	const char *ss="hello write\n";
	write(1,ss,strlen(ss));

	fork();
	//向标准输出进行打印，stdout，cin -> 1
	//std::cout << "hello cout"<< std::endl;
	//printf("hello printf\n");

	////向标准错误进行打印 ,stderr,cerr -> 2
	//std::cerr << "hello cerr" << std::endl;
	//fprintf(stderr,"hello stderr\n");
	return 0;
}
